PG_PASSWD (1)
Manipulate the flat password file
SYNOPSIS
pg_passwd filename
DESCRIPTION
pg_passwd
is a tool to manipulate the
flat password file functionality of
Postgres. This style of password
authentication is not required in an
installation, but is one of several supported security mechanisms.
Specify the password file in the same style of
Ident authentication in
$PGDATA/pg_hba.conf:
host unv 133.65.96.250 255.255.255.255 password passwd
where the above line allows access from 133.65.96.250 using the passwords listed
in $PGDATA/passwd.
The format of the password file follows those of
/etc/passwd
and
/etc/shadow.
The first field is the user name, and the second field
is the encrypted password.
The rest is completely ignored.
Thus the following three sample lines specify the same user and password pair:
pg_guest:/nB7.w5Auq.BY:10031::::::
pg_guest:/nB7.w5Auq.BY:93001:930::/home/guest:/bin/tcsh
pg_guest:/nB7.w5Auq.BY:93001
Supply the password file to the pg_passwd command.
In the case described above, after changing the working directory to
PGDATA, the following command execution specify
the new password for pg_guest:
% pg_passwd passwd
Username: pg_guest
Password:
Re-enter password:
where the Password:
and Re-enter password:
prompts require the same password input which are not displayed
on the terminal.
The original password file is renamed to
passwd.bk.
psql
uses the -u
option to invoke this style of
authentication.
The following lines show the sample usage of the option:
% psql -h hyalos -u unv
Username: pg_guest
Password:
Welcome to the POSTGRESQL interactive sql monitor:
Please read the file COPYRIGHT for copyright terms of POSTGRESQL
type \\? for help on slash commands
type \\q to quit
type \\g or terminate with semicolon to execute query
You are currently connected to the database: unv
unv=>
Perl5 authentication
uses the new style of the Pg.pm like this:
$conn = Pg::connectdb("host=hyalos dbname=unv
user=pg_guest password=xxxxxxx");
For more details, refer to
src/interfaces/perl5/Pg.pm.
Pg{tcl,tk}sh authentication
uses the
pg_connect
command with the
-conninfo
option thusly:
% set conn [pg_connect -conninfo \\\\
"host=hyalos dbname=unv \\\\
user=pg_guest password=xxxxxxx "]
You can list all of the keys for the option by executing the following
command:
% puts [ pg_conndefaults]
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